E3S Web Conf.
Volume 166, 2020The International Conference on Sustainable Futures: Environmental, Technological, Social and Economic Matters (ICSF 2020)
|Number of page(s)||8|
|Section||Geotechnical and Geoenvironmental Engineering|
|Published online||22 April 2020|
Development of resource-saving technology when mining ore bodies by blocks under rock pressure
Kryvyi Rih National University, Department of Underground Mining of Mineral Deposit, 11 Vitalii Matusevych Str., Kryvyi Rih, 50027, Ukraine
2 Kryvyi Rih National University, Department of labor protection and civil security, 11 Vitalii Matusevych Str., Kryvyi Rih, 50027, Ukraine
3 Kryvyi Rih National University, Department of Mine Surveying, 11 Vitalii Matusevych Str., Kryvyi Rih, 50027, Ukraine
* Corresponding author: firstname.lastname@example.org
The article aims to develop the resource-saving technology when mining steep ore bodies applying 250 mm-diameter boreholes to break ore into the compressed environment. This will reduce dilution of the mined ore mass in conditions of rock pressure around blocks. When mining iron ore deposits of Kryvyi Rih basin, applied mining systems allow for creation of the compensatory space as the first stage. However, these stopes fail under rock pressure, this influencing negatively ore breaking and extraction. The degree of extraction can be increased through breaking ore mass into the compressed environment. The width of the ore layer to be broken onto the compressed environment is determined through industrial investigations. To enhance breaking conditions, it is suggested to apply boreholes of a larger diameter. However, there is no technique developed for determining thickness of the ore layer to be broken depending on the borehole diameter and the fragmentation factor. When applying 250 mm boreholes, increase of thickness of the layer to be broken from 2 to 10 m is found to cause compaction of the previously broken layer up to 3 m with the optimal ore fragmentation factor of 1.3–1.5 and 3-fold decrease of lumps yield. This results from the fact that drilling a 250 mm borehole to secure even provision of the massif with explosives reduces the line of the least resistance.
© The Authors, published by EDP Sciences, 2020
This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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